As a general rule, Outlook rules make for fantastic practical joking. You can cause all sorts of odd and amusing things to happen based on your own sets of specific conditions.
While on an unsuspecting friend’s PC, open the “Rules and Alerts” setup under the Outlook“Tools” menu. Create a new rule and get creative — the results are up to you.
The Final Product:
Try starting with strange behaviors set to occur every time an e-mail from you comes in. Maybe a cheerful tune automatically starts playing or a hard copy of the message is instantly printed. Heck, you could even have the e-mail forward itself back to your friend a second time for extra emphasis. The options are all there.